ios手势参数 

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UITapGestureRecognizer *tapGestureRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapGestureRecognizer:)];
[self addGestureRecognizer:tapGestureRecognizer];

- (void)handleTapGestureRecognizer:(UITapGestureRecognizer *)tapGestureRecognizer {
    [self hiddenAnimationCompletion:^(BOOL finished) {
        
    }];
}
  1. initWithTarget:self 后面方法（handleTapGestureRecognizer）所属的对象
  2. [self addGestureRecognizer:tapGestureRecognizer];把手势关联到哪个对象上面，目前是self，也可以是self.view.